20445803 has 4 divisors (see below), whose sum is σ = 23366640. Its totient is φ = 17524968.

The previous prime is 20445791. The next prime is 20445823. The reversal of 20445803 is 30854402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30854402 = 2 ⋅15427201.

It is a cyclic number.

It is not a de Polignac number, because 20445803 - 2⁶ = 20445739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460408 + ... + 1460421.

It is an arithmetic number, because the mean of its divisors is an integer number (5841660).

Almost surely, 2^20445803 is an apocalyptic number.

20445803 is a deficient number, since it is larger than the sum of its proper divisors (2920837).

20445803 is an equidigital number, since it uses as much as digits as its factorization.

20445803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920836.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 20445803 is about 4521.7035506543. The cubic root of 20445803 is about 273.4437852574.

The spelling of 20445803 in words is "twenty million, four hundred forty-five thousand, eight hundred three".